The Steam version features the same levels as the mobile and tablet versions of the game (except for the very first level). What's different is that the Steam version has a Fast Forward feature and a couple of neat graphical effects, so the game looks more impressive on a PC or Mac. You also get great Steam integration in form of Steam Achievements and Steam Cloud (even works between PC and Mac). Plus, there's a bonus PDF booklet in the Steam version that includes early sketches of the game.

The world rank for a level is calculated by (A) the number of collected plants, and (B) the number of saved spirits, where a plant is worth a thousand spirits. If two players have the same number of plants and spirits for a level, they will have the same rank. Time is not factored in. In some levels, it's possible to save more spirits then required for the Perfect solution.

Are you planning to add more levels?

Not at this moment, but the Steam release added new bonus levels designed by pyjamads, one of the best Spirits players worldwide (he ranked #1 on iOS for months). Read more about him and the new levels on our blog[www.spacesofplay.com].

We don't have an official age rating for Spirits, but we have heard from parents that their (young) kids enjoy it. After the first dozen levels the difficulty ramps up quite a bit though. That said, it's a completely non-violent game with a very peaceful and relaxing atmosphere.